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Table of Content

      
    20 March 2014
    Volume 49 Issue 03
    Pollinators and pollen polymorphism of  Wisteria sinensis (Sims) Sweet
    ZHAO Tong-xin1, LIU Lin-de1*, ZHANG Li1, PAN Cheng-chen2, JIA Xing-jun1
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  1-5.  doi:10.6040/j.issn.1671-9352.0.2013.585
    Abstract ( 1664 )   PDF (1544KB) ( 1423 )   Save
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    The species of floral visitors and foraging behaviors were investigated by field observation, the morphological characteristics of pollens were also investigated by scanning electron microscopy. The main results were as follows: Common floral visitors of W. sinensis within observing time were species of Xylocopa appendiculata Smith and Apis mellifera ligustica Spinola, which belonged to the order of Hymenoptera. They both had legitimate visits as pollinators of W. sinensis. We also found nectar thieving behavior of Apis mellifera ligustica Spinola in the process of visiting. Three different morphological pollens were observed: prolate with tricolporate, elongated-elliptical in equatorial view and sub-3-lobed-circular in polar view; triangular pyramid with hexcolporate, subtriangular in equatorial view and polar view; and the third was tetracolporate, subtriangular in equatorial view and subrhombus in polar view. The extine ornamentation of pollens described above were all like orange peel.
    Comparative analysis on isozymes between Haliotis discus hannai, Haliotis iris and their F1 hybrids
    ZHANG Rui, HOU Xu-guang*, GUO Zhan-sheng, ZHENG Hai, SHI Chao
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  6-11.  doi:10.6040/j.issn.1671-9352.0.2013.490
    Abstract ( 1463 )   PDF (1831KB) ( 804 )   Save
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    The vertical polyacrylamide gel electrophoresis was used to compare the expressions patterns of seven isozymes (SOD,MDH,POD,EST,CAT,ODH and LDH) in both viscera and muscles of Haliotis discus hannai， Haliotis iris and their F1 hybrids,in order to probe how their parents’ genetic affect the expression of the Hybrids’gene in terms of isozymes,and this may provide the molecular basis of the difference among the three strains of abalone.The results shows that there were similar isozyme phenotypes such as ODH in both tissues as well as POD and EST in the muscles of the parents. While there did exist difference in isozyme zymography between the parents, for example MDH, LDH and EST in the viscera.The hybrids were more similar with Haliotis discus hannai, while have larger difference with Haliotis iris, the isozyme zymography of POD, EST, LDH, SOD and MDH in the muscles of F1 hybrids and mother abalone were all the same. Thus, the gene expression of isozymes in the first generation hybrids mainly succeed their mothers.
    Screening and biological characteristics studies of wide wine-making yeasts
    TANG Xiao-hong1, HU Wen-xiao2*, WEI Yan-feng2, JIANG Xi-long2, ZHANG Jing-ying2, SHAO Xue-dong3
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  12-17.  doi:10.6040/j.issn.1671-9352.7.2014.001
    Abstract ( 1760 )   PDF (1120KB) ( 1335 )   Save
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    200 yeast strains were isolated from chardonnay grape skin and vineyard soil of Chateau junding in Penglai Wine Region. 11 yeast strains with excellent performance for wine were selected, one of them (PJ16) was identified as Saccharomyces cerevisiae, respectively based on the analysis of 26SrDNA D1/D2 sequence combination with morphological observation and biochemical and physiological characteristics.Through detection of tolerance and fermentation test, the results showed that the strain PJ16 is suited for brewing grape wine. And the concentrations of its aroma components produced by the strain PJ16, including hexyl alcohol, 1-nonyl alcohol, 2-nonyl alcohol, nonyl aldehyde, benzaldehyde, ethyl acetate, isoamyl acetate, isoamyl acid ethyl ester, ethyl lactate, acetophenone, benzothiazole and 2-acetyl furan, 2-methyl tetrahydrothiophene-3-ketone and beta turkic ketone, were much higher than those of the control group, suggesting that the strain PJ16 had excellent characteristics for wine-making.
    First-principles calculations of the electronic structures and #br# ferromagnetism in 3CSiC #br#
    LIN Xue-ling, PAN Feng-chun*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  18-21.  doi:10.6040/j.issn.1671-9352.0.2013.567
    Abstract ( 1487 )   PDF (1312KB) ( 1564 )   Save
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    Based on the first-principles calculations, the magnetic properties of defects in 3C-SiC were studied. Calculations reveal that the single charged silicon vacancy and the double charged silicon vacancy can respectively induce magnetic moments of 3μB and 2μB; while the neutral one cannot lead to the spontaneous spin polarization. The magnetic coupling between the double charged silicon vacancies is ferromagnetic even when the defect separation is as long as 0.8616nm, which can be explained by the extended tails of defect wave functions; whereas, the single charged silicon vacancies couple antiferromagnetically, which cannot contribute to the magnetism.
    Numerical simulation of direct shear tests for granular matter in 3D#br#
    DENG Xiong, HU Lin*, ZHAO Chuang, GAO Li-ke
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  22-26.  doi:10.6040/j.issn.1671-9352.0.2013.472
    Abstract ( 1274 )   PDF (2636KB) ( 890 )   Save
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     In order to obtain the shear properties of the fault material, five irregular particle units generated by the discrete element method were used to simulate the direct shear process of the fault under natural conditions. By using the experimental data as the simulation parameters, the influences of shear stress of fault were studied with different normal stress, the friction coefficient, particle shape and composition of the irregular particles. The results show that the shear stress increases as the increasing of normal stress, the friction coefficient and the amount of the irregular particles. Furthermore, the changes of porosity under different normal stress, particle shapes or compositions show the changes of shear stress.
    Computing research of the water hammer pressure in the process of #br# the variable speed closure of valve based on UDF method
    GUO Lan-lan1,2, GENG Jie1, SHI Shuo1,3, YUAN Fei1, LEI Li1, DU Guang-sheng1*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  27-30.  doi:10.6040/j.issn.1671-9352.0.2014.010
    Abstract ( 1756 )   PDF (1693KB) ( 1687 )   Save
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    The rotation process of ball valve was simulated by using the sliding grid technology of Fluent software, and the water hammer pressure caused by the suddenly closed of the ball valve in the pipeline was calculated. In the calculation, the standard turbulent model was used with considering the compressibility of water. The rotational speed of ball valve was controlled by UDF. The influence of valve’s closure way and time on water hammer pressure were analyzed. Results show that when the valve is closed at a constant speed, the increase of closing time can reduce the water hammer pressure, and the effect is evident before 0.3s; when the valve closing time is fixed, the deceleration way can effectively reduce the water hammer pressure.
    A novel analytical essential matrix decomposition algorithm#br#
    WU Chun-fu1, TANG Qing-shun1, XIE Huang-sheng1, ZHOU Feng-yu2*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  31-36.  doi:10.6040/j.issn.1671-9352.0.2014.002
    Abstract ( 1710 )   PDF (1607KB) ( 2443 )   Save
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     For purpose of acquiring the pose and position information of two cameras from essential matrix decomposition efficiently, a novel analytical essential matrix decomposition method is proposed. Firstly, by taking essential matrix’s rank 2 property into account, the position information of the two cameras corresponding to two views respectively is acquired. Secondly, the pose information is obtained through solving rotation matrix equations. Finally, in order to distinguish the unique solution that satisfies the reference-point visibility constraint quickly, the 3D point’s imaging depths are obtained directly. The experimental results show that, the proposed method not only avoids the time consuming singular value decomposition operation, but also acquires four analytical solutions that have intuitive and explicit geometric meanings, meanwhile because of the avoidance of the scene structure’s 3D reconstruction, the process of unique solution determination is simplified greatly.
    Observer-based sliding mode control of uncertain singular time-delay systems#br#
    LI Min1,2, LI Qi-qiang1
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  37-42.  doi:10.6040/j.issn.1671-9352.0.2013.433
    Abstract ( 1261 )   PDF (999KB) ( 913 )   Save
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     A variable structure control based on the states of observer was proposed for a class of uncertain singular time-delay systems with mismatched unstructured uncertainties. By using the equivalent control approach, the sliding mode dynamics was given. The sufficient condition was introduced such that the sliding mode dynamics is regular, impulsefree, and asymptotically stable. The sliding surface and the controller’s parameterization was obtained by sloving matrix inequlities via cone complementary linearizable iterative algorithm. The numerical simulation provides evidence for its effectiveness and efficiency.
    θ-completions for subgroups and structure of groups#br#
    GAO Hui, GAO Sheng-zhe*, YIN Li
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  43-45.  doi:10.6040/j.issn.1671-9352.0.2013.258
    Abstract ( 1448 )   PDF (829KB) ( 837 )   Save
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     The notion of θ-completions of a proper subgroup of a finite group is introduced. By using the notion, the structure of a group is studied.
    Regular Ehresmann-typed wrpp semigroups
    DING Yin 1, LI Gang2
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  46-50.  doi:10.6040/j.issn.1671-9352.0.2013.105
    Abstract ( 2208 )   PDF (780KB) ( 502 )   Save
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    The regular Ehresmann-typed wrpp semigroupm is defined, and then by means of C-wrpp semigroups, left regular Ehresmann-typed wrpp semigroups and right regular Ehresmanntyped wrpp semigroups, Some structure theorems of such semigroups are given.
    θ-fuzzy homomorphism of groups#br#
    HAO Cui-xia, YAO Bing-xue*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  51-56.  doi:10.6040/j.issn.1671-9352.0.2013.549
    Abstract ( 1423 )   PDF (876KB) ( 1030 )   Save
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    The concepts of θ-fuzzy mapping and θ-fuzzy homomorphism of groups are introduced. Some properties of the θ-fuzzy homomorphism are studied, and the relationships between the (λ, μ)-fuzzy normal subgroups under θ-fuzzy homomorphism are discussed. Finally, the fundamental theorem of θfuzzy homomorphism is established.
    Skew nil McCoy rings
    ZHANG Wan-ru
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  57-62.  doi:10.6040/j.issn.1671-9352.0.2013.285
    Abstract ( 1349 )   PDF (831KB) ( 1050 )   Save
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     The nil-McCoy property of rings is considered in skew polynomial rings, and the notion of α-nil-McCoy rings is introduced, examples are given and the extensions of α-nil-McCoy rings are investigated. This generalize the results relate to nil-McCoy rings.
    On strict filters of BL-algebras#br#
    YANG Yong-wei1, 2, HE Peng-fei2, LI Yi-jun2,3
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  63-67.  doi:10.6040/j.issn.1671-9352.0.2013.482
    Abstract ( 1462 )   PDF (836KB) ( 838 )   Save
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    In order to study the filter theory of BL-algebras, the concept of strict filters is introduced, and relationships between strict filters and SBL-algebra are showed. It is proved that if F is both a fantastic and strict filter of a BL-algebra L, then L/F is a Gdel algebra. Finally, relationships among strict filters, integral filters, prime filters and other kinds of filters are displayed.
    Asymptotic behavior of a stochastic ratio-dependent chemostat model#br#
    DONG Qing-lai
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  68-72.  doi:10.6040/j.issn.1671-9352.0.2013.576
    Abstract ( 1355 )   PDF (843KB) ( 818 )   Save
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    This paper studies the asymptotic behavior of a stochastic Chemostat model with ratio-dependent functional response in which the dilution rate was influenced by white noise. The long time behavior of the model is studied. There exists a unique positive solution by stochastic comparison theorem. Using Lyapunov function, we show the washout equilibrium is stochastically asymptotically stable in the large. Furthermore, we show how the solution spirals around the positive equilibrium of deterministic system.
    Exponential synchronization of stochastic BAM neural networks with#br# S-type distributed delays
    MA Kui-sen, WANG Lin-shan*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  73-78.  doi:10.6040/j.issn.1671-9352.0.2013.519
    Abstract ( 1153 )   PDF (925KB) ( 630 )   Save
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    By using Lyapunov functional method,It formular and with the help of stochastic analysis technique, the sufficient conditions to guarantee the exponential synchronization in mean square for the neural networks were obtained. An example was given to demonstrate the advantage and applicability of the proposed results and some results of related literature were extended.
    Bifurcation structure of asymptotically linear second-order #br# semipositone discrete boundary value problem#br#
    ZHANG Lu, MA Ru-yun
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  79-83.  doi:10.6040/j.issn.1671-9352.0.2013.495
    Abstract ( 1089 )   PDF (807KB) ( 590 )   Save
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    It is studied that  the existence of positive solutions of second-order semipositone discrete boundary value problem with the nonlinearity satisfies asymptotically linear conditions,
    -Δ2u(t-1)=λf(t,u(t)), t∈［1,T］Z,
    αu(0)-βΔu(0)=0, γu(T)+δΔu(T)=0,
    where λ is a positive parameter, f:［1,T］Z×R+→R is continuous, The proofs of the main results are based on the topological degree techniques and bifurcation theory.
    Boundedness of commutators related to Marcinkiewicz integrals with #br# variable kernels on weighted weak Hardy spaces#br#
    PAN Yali, LI Chang-wen
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  84-89.  doi:10.6040/j.issn.1671-9352.0.2013.476
    Abstract ( 1459 )   PDF (831KB) ( 968 )   Save
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    The boundedness of the commutators μΩ,b related to Marcinkiewicz with variable kernels on weighted weak Hardy spaces are proved. By the atomic decompositions of weighted weak Hardy spaces, some results about μΩ,b are obtained under the hypothesis that the kernel satisfies a certain condition, where b∈BMO. The same results are shown for the commutator μρΩ,b related to the parametric Marcinkiewicz integral μρΩ
    The perturbation for the Browder’s theorem of operator matrix#br#
    WANG Bi-yu, CAO Xiao-hong*
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  90-95.  doi:10.6040/j.issn.1671-9352.0.2013.575
    Abstract ( 1550 )   PDF (830KB) ( 622 )   Save
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     Let T=AB
    0JA*J∈B(HH), where A,B∈B(H), conjugation J is an antilinear operator on H, which satisfies J2=I and 〈Jx,Jy〉=〈y,x〉 for all x,y∈H. The stability of the single valued extension property and the Browder’s theorem for T under compact perturbations are explored.
    Customer lifetime value and property with #br# homogeneous Poisson response
    SHI Ai-ling1, MA Ming2*, ZHENG Ying2
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  96-100.  doi:10.6040/j.issn.1671-9352.0.2013.572
    Abstract ( 1456 )   PDF (805KB) ( 684 )   Save
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    Recently, the customer relationship management has become the main strategy of marketing, and customer lifetime value plays a key role in customer relationship management. Based on the censored  δ  shock model and its marked process, the probability distribution of customer lifetime of homogeneous Poisson marketing system was discussed, and the expectation, second moment and variance of the instantaneous customer lifetime value and the total customer lifetime value were obtained.
    The Berry-Esseen bound for the sequence of #br# negatively associated random variables#br#
    LIU Ting-ting, CHEN Zhi-yong, LI Xiao-qin*, YANG Wen-zhi
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  101-106.  doi:10.6040/j.issn.1671-9352.0.2013.290
    Abstract ( 2168 )   PDF (829KB) ( 939 )   Save
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    The negatively associated(NA) sequence of random variables is a weak dependent sequence. The BerryEssen bound for the sequence of negatively associated random variables was discussed. Under some diffident conditions, the BerryEsseen bounds were respectively presented as O(n-1／4·logn·loglogn) and O(n-1／6·logn·loglogn), and the results extend the corresponding one in the literature.
    Representation theorem and converse comparison theorem of#br#  RBSDEs with continuous coefficient#br#
    ZHENG Shi-qiu, FENG Li-chao, LIU Qiu-mei
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2014, 49(03):  107-110.  doi:10.6040/j.issn.1671-9352.0.2013.443
    Abstract ( 1522 )   PDF (810KB) ( 779 )   Save
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    A local representation theorem of reflected backward stochastic differential equations whose coefficient is continuous and satisfies linear increasing condition was established under some suitable conditions. By this representation theorem, a local converse comparison theorem of this kind of  BSDEs was obtained.
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